Demolding mechanism for push-pull type injection molding machine based on material identification
By introducing temperature identification modules and demolding components into the injection molding machine, the problem of uncontrollable material identification and demolding force of the injection molding machine is solved, and efficient and automated injection molding and demolding processes are realized, improving production quality and efficiency.
Patent Information
- Application Number
- CN202510854017.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-24
- Publication Date
- 2025-07-25
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Existing injection molding machines cannot identify the type of material based on the injection molding temperature, resulting in inaccurate mold temperature control, affecting the injection molding quality, and uncontrollable force during mold release, resulting in damage to the surface of the part and low demolding efficiency.
The release mechanism for push-pull injection molding machines based on material identification is adopted, and the plastic temperature is identified through the temperature identification module, the heating system temperature is adjusted, and the release component is used to cooperate with the buffer structure to achieve automatic mold release and force control.
It improves injection molding quality and mold release efficiency, protects part quality, reduces manual operation, improves productivity, and extends the service life of the equipment.
Smart Images
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Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of demoulding of injection molding machines, and particularly relates to a demoulding mechanism for a push-pull type injection molding machine based on material identification. Background Technique
[0002] An ordinary injection molding machine melts plastic particles by heating the barrel, and then solidifies and forms the product by cooling with a mold. Thermoplastic plastics exhibit different performance characteristics in injection molding. For example, PE has good fluidity and strong flexibility, and is suitable for manufacturing plastic toys, film bags, etc.; PP has high strength and rigidity, and is suitable for manufacturing furniture, automotive parts, etc.; ABS has strong impact resistance and is suitable for manufacturing products with complex shapes. Common thermoplastic plastics include polyethylene (PE), polypropylene (PP), ABS9, etc. The molding temperature of polyethylene is 140 - 220 °C, and the mold temperature is 50 - 70 °C. The molding temperature of polypropylene is 220 - 275 °C, and the mold temperature is 40 - 80 °C; Currently, the injection molding machines on the market cannot identify the material type according to the injection temperature, so as to adjust the temperature inside the mold, resulting in a reduction in injection molding quality. Moreover, when demoulding after injection molding, the force during demoulding cannot be controlled, resulting in damage to the surface quality of the injection molded parts, and the demoulding efficiency is also low. Manual operation is required, which greatly reduces the productivity. This phenomenon has become an urgent problem for those in this field to solve. Summary of the Invention
[0003] The purpose of the present invention is to provide a demoulding mechanism for a push-pull type injection molding machine based on material identification to solve the problems raised in the above background technique.
[0004] To solve the above technical problems, the present invention provides the following technical solution: A demoulding mechanism for a push-pull type injection molding machine based on material identification, including an injection molding device. The injection molding device includes a base, a front mold, a rear mold, and a push-pull mechanism. The push-pull mechanism includes a hydraulic chamber, a hydraulic plate, a hydraulic rod, and a demoulding part. The front mold and the hydraulic chamber are respectively fixedly installed on the left and right sides above the base. The hydraulic plate is slidably connected in the hydraulic chamber and is fixed to the rear mold through the hydraulic rod. The hydraulic chamber is connected to an external hydraulic pump through a pipeline. Injection grooves are provided on the upper and lower lines inside the rear mold, and one end of each injection groove is connected to an injection pipe, and the other end is connected to an external plastic pipeline, and a pump is provided in the pipeline. After the rear mold moves, it is inserted into the front mold. A temperature identification module is provided inside the injection groove, and a heating system is provided inside the front mold, and a temperature adjustment module is provided inside the heating system. The temperature identification module is electrically connected to the temperature adjustment module. A through hole is provided in the middle of the rear mold, and the demoulding part is provided in the through hole and includes two sliding plugs and two groups of demoulding components. Both sliding plugs are slidably connected in the through hole, and the space between the two sliding plugs is connected to an external air pump through a pipeline.
[0005] The present invention further illustrates that the temperature recognition module is used to recognize the plastic temperature in the injection groove, so as to determine the material type, and the temperature adjustment module is used to adjust the temperature of the heating system according to the plastic material type in the injection groove, so as to control the temperature in the front mold; the demolding part further includes a sliding rod, the sliding rod is fixedly installed on the inner wall of the through hole, and both sets of the demolding components include a sleeve block, the sleeve block is fixedly installed on the outer side of the sliding rod, and the sliding plug is slidably connected to the sleeve block.
[0006] The present invention further illustrates that both sets of the demolding components further include a buffer block, a limiting disk, a supporting disk and a spring. The buffer block is attached to one side of the sleeve block and is slidably connected to the sliding rod. The limiting disk is fixedly installed at the outer end of the sliding rod. The supporting disk is sleeved on the sliding rod and is attached to the limiting disk. The spring is sleeved on the outer side of the sliding rod and is located between the supporting disk and the buffer block.
[0007] The present invention further illustrates that the inner side of the sliding plug is inclined, the edge of the buffer block is in an arc-shaped stepped shape, and a sphere is embedded between the arc-shaped stepped part and the inclined part of the sliding plug.
[0008] The present invention further illustrates that the outer end of the sliding rod is provided with a threaded part, the middle of the supporting disk is provided with a threaded hole, and after the supporting disk rotates clockwise, it is threadedly connected to the threaded part of the sliding rod; the middle of the sliding plug is provided with a through hole, and an internal hexagonal nut is rotatably connected in the through hole, and the internal hexagonal nut is fixedly connected to the supporting disk.
[0009] The present invention further illustrates that the buffer block includes an outer block and an inner block. The inner end of the inner block is provided with a convex platform to limit the outer block through the convex platform. The outer side of the inner block is fixed with a threaded block, the outer side of the outer block is fixed with a threaded sleeve, and the threaded sleeve is threadedly connected to the threaded block; a groove is provided on the inner side of the threaded sleeve, and a convex block is provided on the outer side of the supporting disk, and the convex block is slidably connected to the groove of the threaded sleeve.
[0010] The present invention further illustrates that when the supporting disk rotates counterclockwise, the outer block moves, and when the supporting disk rotates clockwise, the outer block idles on the inner block.
[0011] The present invention further illustrates that a guide block is provided on the outer side of the sliding rod, and a guide groove is provided on the inner side of the inner block, and the inner block is slidably connected to the guide block of the sliding rod through the guide groove.
[0012] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention determines whether the material is polyethylene or polypropylene by identifying the plastic temperature. Then, the temperature adjustment module controls the temperature of the heating system inside according to the material type. For polyethylene, the temperature is controlled at 50 - 70 °C, and for polypropylene, the temperature is controlled at 40 - 80 °C, thereby ensuring the molding quality and smoothly taking out the parts through the demolding part to improve the demolding efficiency and thus increase the productivity. During the demolding process, through buffering, it is avoided that the sliding plug moves too fast when pushed by air pressure, which may cause impact on the parts and prevent the parts from being damaged, playing a role in protecting the quality of the parts. And through the sphere as an intermediate force transmission, when the sliding plug moves outward or returns inward, the speed can be kept stable, ensuring both the buffering effect and preventing the collision between structures from affecting the service life of the structure. Moreover, the force applied when the sliding plug holds the parts can increase steadily, further improving the injection molding quality of the parts. After multiple injection molding demoldings, adjust the pressure applied to the spring. The resistance to the movement of the sliding plug increases, the buffering intensity increases, the moving speed becomes slower, and the force applied to hold the parts decreases, thereby ensuring the quality of the parts and maximizing the utilization of the spring, reducing its replacement frequency to control costs. Description of the Drawings
[0013] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings: Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the internal structural schematic diagram of the hydraulic cavity of the present invention; Figure 3 is the internal structural schematic diagram of the rear mold of the present invention; Figure 4 is the structural schematic diagram of the demolding part of the present invention; Figure 5 is the internal structural schematic diagram of the demolding part of the present invention; Figure 6 is the exploded view of the demolding part of the present invention; Figure 7 is the schematic diagram of Embodiment 1 of the present invention; Figure 8 is the schematic diagram of Embodiment 2 of the present invention; Figure 9 is the schematic diagram of Embodiment 3 of the present invention; In the figure: 1. Base; 2. Front mold; 3. Rear mold; 31. Slide plug; 32. Slide rod; 321. Limit disk; 33. Sleeve block; 34. Outer block; 341. Inner block; 342. Threaded block; 343. Threaded sleeve; 35. Support disk; 36. Spring; 37. Sphere; 38. Hexagon socket head cap screw; 4. Hydraulic chamber; 41. Hydraulic plate; 42. Hydraulic rod; 5. Injection pipe. Detailed implementation mode
[0014] The following further non-limiting detailed description of the technical solution of the present invention is made in conjunction with the preferred embodiments and their accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work belong to the scope of protection of the present invention.
[0015] Please refer to Figures 1-9 , the present invention provides a technical solution: a demoulding mechanism for a push-pull type injection molding machine based on material recognition, including an injection molding device, the injection molding device includes a base 1, a front mold 2, a rear mold 3 and a push-pull mechanism, the push-pull mechanism includes a hydraulic chamber 4, a hydraulic plate 41, a hydraulic rod 42 and a demoulding part; The front mold 2 and the hydraulic chamber 4 are respectively fixedly installed on the left and right sides above the base 1, the hydraulic plate 41 is slidably connected in the hydraulic chamber 4, and is fixed to the rear mold 3 through the hydraulic rod 42. The hydraulic chamber 4 is connected to an external hydraulic pump through a pipeline. Injection grooves are arranged on the upper and lower lines inside the rear mold 3, and one end of the injection groove is connected to an injection pipe 5, and the other end is connected to an external plastic pipeline, and a pump is arranged in the pipeline. After the rear mold 3 moves, it is inserted into the front mold 2. A temperature recognition module is arranged inside the injection groove, and a heating system is arranged inside the front mold 2, and a temperature adjustment module is arranged inside the heating system. The temperature recognition module is electrically connected to the temperature adjustment module. A through hole is arranged in the middle of the rear mold 3, and the demoulding part is arranged in the through hole and includes two slide plugs 31 and two groups of demoulding components. Both slide plugs 31 are slidably connected in the through hole, and an external air pump is connected through a pipeline between the two slide plugs 31; When the external hydraulic pump operates, liquid is injected into the hydraulic chamber 4 through the pipeline, and the hydraulic pressure pushes the hydraulic plate 41 to move, so as to drive the rear mold 3 to move through the hydraulic rod 42 until the rear mold 3 is inserted into the front mold 2. Then, the plastic material is extracted and injected into the injection groove of the rear mold 3 through the pump, and then injected into the front mold 2 through the injection pipe 5 for injection molding work. During the molding process, the plastic temperature in the injection groove is recognized by the temperature recognition module. The molding temperature of polyethylene is 140-220°C, and the molding temperature of polypropylene is 220-275°C. By recognizing the plastic temperature, it is judged whether the material is polyethylene or polypropylene. Then, the temperature adjustment module controls the temperature of the heating system inside the front mold 2 according to the material type. For polyethylene, the temperature is controlled at 50-70°C, and for polypropylene, the temperature is controlled at 40-80°C, so as to ensure the molding quality; After molding is completed, the demoulding unit operates to fix the molded parts, and then the external hydraulic pump extracts the liquid in the hydraulic chamber 4, so that the rear mold 3 is reset, separated from the front mold 2, and the parts are taken out. The injection molding is automated and efficient, and the temperature control of the mold is more intelligent, which greatly improves the production quality and production efficiency of parts.
[0016] The temperature recognition module is used to identify the temperature of the plastic in the injection molding tank, thereby determining the type of material. The temperature adjustment module is used to adjust the temperature of the heating system according to the type of plastic material in the injection molding tank, thereby controlling the temperature in the front mold 2. The demoulding part further includes a slide bar 32, which is fixedly mounted on the inner wall of the through hole. Both sets of demoulding components include a sleeve block 33, which is fixedly mounted on the outer side of the slide bar 32, and the sliding plug 31 is slidably connected to the sleeve block 33. like Figure 7 As shown, after the injection molding is completed, the external air pump injects gas into the through hole through the pipeline, and the internal air pressure increases, pushing the two sliding plugs 31 to slide synchronously outward along the inner wall of the through hole, and the inner side slides on the sleeve block 33, thereby supporting the part outward. After that, after the rear mold 3 is reset, the part can be smoothly taken out to improve the demoulding efficiency, thereby improving productivity.
[0017] Both sets of demoulding components also include a buffer block, a limit plate 321, a support plate 35 and a spring 36. The buffer block is fitted with one side of the sleeve block 33 and is slidably connected to the slide rod 32. The limit plate 321 is fixedly installed on the outer end of the slide rod 32. The support plate 35 is sleeved on the slide rod 32 and fits with the limit plate 321. The spring 36 is sleeved on the outer side of the slide rod 32 and is located between the support plate 35 and the buffer block.
[0018] The inner side of the sliding plug 31 is inclined, the edge of the buffer block is in an arc-shaped step shape, and a ball 37 is embedded between the arc-shaped step portion and the inclined portion of the sliding plug 31; Embodiment 1: like Figure 7 As shown, during the demoulding process, the sliding plug 31 extends out of the through hole to press against the part with a greater force. At this time, when the sliding plug 31 moves outward, it pushes the ball 37, and the ball 37 presses against the buffer block, so that it slides outward through the slide rod 32. The spring 36 is squeezed and deformed, thereby generating a reaction force, which plays a buffering role, preventing the sliding plug 31 from hitting the part too fast when pushed by the air pressure, preventing the part from being damaged, and playing a role in protecting the quality of the part; The ball 37 is used as an intermediate force transmission, so that when the sliding plug 31 moves outward or resets inward, the speed can be kept stable, which can not only ensure the buffering effect, but also prevent collisions between structures that affect the service life of the structures. The force applied by the sliding plug 31 when it presses against the parts can be steadily increased to further improve the injection molding quality of the parts.
[0019] The outer end of the sliding rod 32 is provided with a threaded portion, and a threaded hole is provided in the middle of the support plate 35, and after the support plate 35 rotates clockwise, it is threadedly connected to the threaded portion of the sliding rod 32; A through hole is provided in the middle of the sliding plug 31, and an internal hexagonal nut 38 is rotatably connected in the through hole, and the internal hexagonal nut 38 is fixed to the support plate 35; Embodiment Two: As Figure 8 shown, after multiple injection molding and demolding, it is found that there are still marks left by the ejection of the sliding plug 31 on the inner side of the part, or at this time, after multiple deformations of the spring 36, the fatigue degree increases and the elasticity decreases. The operator can insert an internal hexagonal wrench into the through hole of the sliding plug 31 and connect it to the internal hexagonal nut 38, and then rotate the internal hexagonal nut 38 clockwise to drive the support plate 35 to rotate clockwise, so as to be connected to the threaded portion of the sliding rod 32 and move inward along the threaded portion while rotating, pressing on the spring 36. When injection molding and demolding again, the resistance to the movement of the sliding plug 31 increases, the buffering strength increases, the moving speed becomes slower, and the force on the part is reduced, thereby ensuring the quality of the part, and the utilization of the spring 36 reaches the maximum, reducing its replacement frequency to control costs.
[0020] The buffer block includes an outer block 34 and an inner block 341. A boss is provided at the inner end of the inner block 341, and the outer block 34 is limited by the boss. A threaded block 342 is fixed to the outside of the inner block 341, and a threaded sleeve 343 is fixed to the outside of the outer block 34, and the threaded sleeve 343 is threadedly connected to the threaded block 342; A groove is provided inside the threaded sleeve 343, and a convex block is provided on the outside of the support plate 35, and the convex block is slidably connected to the groove of the threaded sleeve 343.
[0021] After the support plate 35 rotates counterclockwise, the outer block 34 moves. After the support plate 35 rotates clockwise, the outer block 34 idles on the inner block 341.
[0022] A guide block is provided on the outside of the sliding rod 32, and a guide groove is provided on the inside of the inner block 341, and the inner block 341 is slidably connected to the guide block of the sliding rod 32 through the guide groove; Embodiment Three: As Figure 9As shown, polypropylene has high strength but is not easy to demold. For the parts that hold the polypropylene material, the operator can turn the hexagon socket nut 38 counterclockwise to drive the support plate 35 to rotate counterclockwise. At this time, the support plate 35 idles on the slide bar 32. Meanwhile, the convex block drives the threaded sleeve 343 to rotate. The threaded sleeve 343 drives the outer block 34 to rotate and is threadedly connected with the threaded block 342, so as to move outward while rotating. After the outer block 34 moves outward, the moving distance of the sphere 37 increases, making the moving stroke of the sliding plug 31 increase, which can strengthen the holding force on the polypropylene part and improve the force during demolding, thereby further increasing the demolding speed. Through the guide block and the guide groove, the inner block 341 is fixed, so that the threaded sleeve 343 can be smoothly threadedly connected with the threaded block 342. When the support plate 35 resets and rotates clockwise, it drives the outer block 34 to idle on the inner block 341 to avoid the movement of the support plate 35 being restricted. Embodiment 4: As Figure 6 shown, after the sealing performance inside the through hole decreases, maintenance is required, such as replacing structural parts or adding a sealing structure. The operator can directly loosen the support plate 35 completely counterclockwise until the threaded sleeve 343 moves outward to the limit position, so as to disengage from the threaded block 342, and the sphere 37 drops, which is convenient for taking out the sliding plug 31 and maintaining and replacing the internal structure, or adding a sealing structure. The overall structure is simple, the disassembly and assembly are simple, and the manufacturing cost is low.
[0023] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention.
[0024] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A demoulding mechanism for a push-pull injection molding machine based on material recognition, including injection molding equipment, characterized in that: The injection molding device includes a base (1), a front mold (2), a rear mold (3), and a push-pull mechanism. The push-pull mechanism includes a hydraulic chamber (4), a hydraulic plate (41), a hydraulic rod (42), and a demolding part. The front mold (2) and the hydraulic chamber (4) are respectively fixedly installed on the left and right sides above the base (1). The hydraulic plate (41) is slidably connected in the hydraulic chamber (4) and is fixed to the rear mold (3) through the hydraulic rod (42). The hydraulic chamber (4) is connected to an external hydraulic pump through a pipeline. Injection slots are provided on the upper and lower lines inside the rear mold (3). One end of each injection slot is connected to an injection pipe (5), and the other end is connected to an external plastic pipeline. A pump is provided in the pipeline. After the rear mold (3) moves, it is inserted into the front mold (2). A temperature recognition module is provided inside the injection slot. A heating system is provided inside the front mold (2), and a temperature adjustment module is provided inside the heating system. The temperature recognition module is electrically connected to the temperature adjustment module. A through hole is provided in the middle of the rear mold (3). The demolding part is provided in the through hole and includes two sliding plugs (31) and two sets of demolding components. Both of the sliding plugs (31) are slidably connected in the through hole, and an external air pump is connected through a pipeline between the two sliding plugs (31).
2. The demolding mechanism for a push-pull injection molding machine based on material recognition according to claim 1, characterized in that: The temperature recognition module is used to recognize the temperature of the plastic in the injection slot, so as to judge the material type. The temperature adjustment module is used to adjust the temperature of the heating system according to the plastic material type in the injection slot, so as to control the temperature inside the front mold (2). The demolding part further includes a sliding rod (32). The sliding rod (32) is fixedly installed on the inner wall of the through hole. Both sets of demolding components include a sleeve block (33). The sleeve block (33) is fixedly installed on the outside of the sliding rod (32). The sliding plug (31) is slidably connected to the sleeve block (33).
3. The demoulding mechanism for a push-pull injection molding machine based on material recognition according to claim 2, characterized in that: Both sets of demolding components further include a buffer block, a limit disk (321), a support disk (35), and a spring (36). The buffer block is attached to one side of the sleeve block (33) and is slidably connected to the sliding rod (32). The limit disk (321) is fixedly installed at the outer end of the sliding rod (32). The support disk (35) is sleeved on the sliding rod (32) and is attached to the limit disk (321). The spring (36) is sleeved on the outside of the sliding rod (32) and is located between the support disk (35) and the buffer block.
4. The demoulding mechanism for a push-pull injection molding machine based on material recognition according to claim 3, wherein: The inner side of the sliding plug (31) is inclined. The edge of the buffer block is in an arc-shaped stepped shape, and a sphere (37) is embedded between the arc-shaped stepped part and the inclined part of the sliding plug (31).
5. The demoulding mechanism for a push-pull injection molding machine based on material recognition according to claim 4, characterized in that: The outer end of the sliding rod (32) is provided with a threaded part. A threaded hole is provided in the middle of the support disk (35). After the support disk (35) rotates clockwise, it is threadedly connected to the threaded part of the sliding rod (32). A through hole is provided in the middle of the sliding plug (31), and an internal hexagonal nut (38) is rotatably connected in the through hole. The internal hexagonal nut (38) is fixed to the support disk (35).
6. The demolding mechanism for a push-pull injection molding machine based on material recognition according to claim 5, characterized in that: The buffer block includes an outer block (34) and an inner block (341). A boss is provided at the inner end of the inner block (341), and the outer block (34) is limited by the boss. A threaded block (342) is fixed to the outside of the inner block (341), and a threaded sleeve (343) is fixed to the outside of the outer block (34). The threaded sleeve (343) is threadedly connected to the threaded block (342); a groove is provided inside the threaded sleeve (343), and a convex block is provided on the outside of the support plate (35), and the support plate (35) is slidably connected to the groove of the threaded sleeve (343) through the convex block.
7. The demoulding mechanism for a push-pull injection molding machine based on material recognition according to claim 6, characterized in that: After the support plate (35) rotates counterclockwise, the outer block (34) moves. After the support plate (35) rotates clockwise, the outer block (34) idles on the inner block (341).
8. The demolding mechanism for a push-pull injection molding machine based on material recognition according to claim 7, characterized in that: A guide block is provided on the outside of the sliding rod (32), and a guide groove is provided on the inside of the inner block (341), and the inner block (341) is slidably connected to the guide block of the sliding rod (32) through the guide groove.